Perhaps you should try some spelling variations:
"research profession" » "research professional", "research progression", "research professionals"
"research procedures" » "search procedures", "search procedure", "research proceedings"
"research professor" » "research progresson", "search processor", "research professional"
"research processes" » "research projects", "research progress", "research practices", "research progresses", "research projectses", "research problemses"
"research prozess" » "research progress", "research propels", "research proteases"
"research process" » "research progress", "research projects", "research problems"

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (((((("research professor") OR ("research profession"))) OR ((("research prozess") OR ("research process"))))) OR ((("research processes") OR ("research procedures")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"research professor\") or (\"research profession\"))) or (((\"research prozess\") or (\"research process\"))))) or (((\"research processes\") OR (\"research procedures\"))))".
• Removing quotes may allow a broader search: (((((( research professor ) or ( research profession ))) or ((( research prozess ) or ( research process ))))) or ((( research processes ) OR ( research procedures )))).
• Adding a wildcard symbol may retrieve word variants: (((((("research professor") or ("research profession"))) or ((("research prozess") or ("research process"))))) or ((("research processes") OR ("research procedures"))))*.